exam Maths Puzzle Numerical Ability

Help with these problems due by tonite....

1. Simplify the rational expression:
x2 - 6x + 5
x2 - 25

2. Divide:
x2 - 9x + 8 � x2 - 1
2x - 4 2x +

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exam Other Question

Ms. Jordan has been given a loan of $2500 for 1 year. If the interest charged is $275, what is the interest rate on the loan? Does anyone know how to do this problem?

I need to find the constant of variation k

M varies directly with N; M = 144 when N= 8

Thanks,
sher